Consider the three classes Alpha, Beta, and Gamma. What is the output of the following code that uses these classes? Alpha a = new Alpha(); System.out.print(a.getTwo()); System.out.print(a.getTwo(2)); 2two public class Alpha extends Gamma { public String getTwo() { return("2"); } public String getTwo(int i) { return("two"); } } public class Beta extends Gamma{ public String getThree() { return ("3"); } public String getFour() { return ("four"); } } public abstract class Gamma { public String getOne() { return ("1"); } public String getFour() { return("4"); }
Consider the three classes Alpha, Beta, and Gamma. What is the output of the following code that uses these classes? Alpha a = new Alpha(); System.out.print(a.getTwo()); System.out.print(a.getTwo(2)); 2two public class Alpha extends Gamma { public String getTwo() { return("2"); } public String getTwo(int i) { return("two"); } } public class Beta extends Gamma{ public String getThree() { return ("3"); } public String getFour() { return ("four"); } } public abstract class Gamma { public String getOne() { return ("1"); } public String getFour() { return("4"); }
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:### Java Inheritance Example
Consider the three classes **Alpha**, **Beta**, and **Gamma**. What is the output of the following code that uses these classes?
```java
Alpha a = new Alpha();
System.out.print(a.getTwo());
System.out.print(a.getTwo(2));
```
**Output:**
```
2two
```
### Class Definitions:
- **Class Alpha (extends Gamma)**
```java
public class Alpha extends Gamma {
public String getTwo() {
return "2";
}
public String getTwo(int i) {
return "two";
}
}
```
- **Class Beta (extends Gamma)**
```java
public class Beta extends Gamma {
public String getThree() {
return "3";
}
public String getFour() {
return "four";
}
}
```
- **Abstract Class Gamma**
```java
public abstract class Gamma {
public String getOne() {
return "1";
}
public String getFour() {
return "4";
}
}
```
### Explanation:
- **Alpha a = new Alpha();**
Creates an instance of the class `Alpha`.
- **System.out.print(a.getTwo());**
Calls the `getTwo()` method from the `Alpha` class, which returns the string `"2"`.
- **System.out.print(a.getTwo(2));**
Calls the overloaded `getTwo(int i)` method from the `Alpha` class, which returns the string `"two"`.
The final output is "2two".
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